Why is my lower radiator hose Cold instead of hot?
If you have a problem with your coolant temperature and realize that the lower radiator hose is cold instead of hot, you could be experiencing problems with the coolant system that needs to get fixed. You will need to look at the various parts that influence the radiator temperature to properly diagnose a lower radiator hose cold problem.
Why is only one hose goes to the heater core?
It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps Was this answer helpful?
Is there an air lock in the heater core?
It sounds like you have a air lock in the heater core. follow this video to bleed the system . It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps
Why is the coolant not going to the heater?
It may happen that the thermostat gauge of your car is broken or not working properly. You might know that if the thermostat is not able to provide a signal to the car that the engine is hot, the coolant will not drive to the heater and the air will remain cool.
What does it mean when return heater hose is hot?
No heat, both heater hoses… If the return heater hose is hot normally that means coolant is flowing through the heater core and is not transferring heat to the air from the blower motor. It is best to use a laser temperature gun and know the exact temperature of the heater core inlet and outlet temperatures.
If you have a problem with your coolant temperature and realize that the lower radiator hose is cold instead of hot, you could be experiencing problems with the coolant system that needs to get fixed. You will need to look at the various parts that influence the radiator temperature to properly diagnose a lower radiator hose cold problem.
It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps Was this answer helpful?
It sounds like you have a air lock in the heater core. follow this video to bleed the system . It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps
Is the top of the radiator hot or cold?
You’re in the right place, all your questions are covered here. The top radiator hose is usually but not always the location of the thermostat. Either-way, the top hose gets hot after the thermostat has opened. The time the thermostat takes to open depends upon factors such as:
What to do if top radiator is overheating?
Remove the splash tray and push the coolant catch tray in. Remove the thermostat cap, usually on the top hose at the engine. Note the stat’s orientation, it is possible in most cases to fit it back-ways, which causes an overheating condition. Clean the stat seat on the engine and cap.
What causes water to overflow from the radiator?
The car still overheats. Again, upper hose hot, lower cold. The radiator is cold by the lower hose, then warm in an arc around the cold section, then hot along the top and on the entire passenger half of the radiator. Radiator fluid overflowed the overflow.
What causes the lower radiator hose to heat up?
Thus, making the lower radiator hose to heat up. It may happen that your car might get low on coolant and is not able to reach the lower radiator. As a result, the lower hose emits cold air.
Is the bottom of the radiator hot or cold?
It may take up to 30 seconds for the thermostat to react and partially close, restricting the flow of coolant from the radiator into the engine. The bottom radiator hose should be cold, or maybe warm on very hot days.
The car still overheats. Again, upper hose hot, lower cold. The radiator is cold by the lower hose, then warm in an arc around the cold section, then hot along the top and on the entire passenger half of the radiator. Radiator fluid overflowed the overflow.
Remove the splash tray and push the coolant catch tray in. Remove the thermostat cap, usually on the top hose at the engine. Note the stat’s orientation, it is possible in most cases to fit it back-ways, which causes an overheating condition. Clean the stat seat on the engine and cap.
Is the bottom hose of an Audi hot or cold?
The car in question I a Audi 1.9 tdi. When you drive the car the temp rises and rises. The top hose is hot/pressurised but the bottom hose is stone cold. Thermostat has bern changed but the problem persists.
Why is the bottom of my water pump cold?
The top hose is hot/pressurised but the bottom hose is stone cold. Thermostat has bern changed but the problem persists. I now have the water pump off and it looks ok? Any help welcome. Do you still have the old thermostat? If so test it in hot water. If it works I’d suspect something like a blocked radiator.
The car in question I a Audi 1.9 tdi. When you drive the car the temp rises and rises. The top hose is hot/pressurised but the bottom hose is stone cold. Thermostat has bern changed but the problem persists.
The top hose is hot/pressurised but the bottom hose is stone cold. Thermostat has bern changed but the problem persists. I now have the water pump off and it looks ok? Any help welcome. Do you still have the old thermostat? If so test it in hot water. If it works I’d suspect something like a blocked radiator.
You’re in the right place, all your questions are covered here. The top radiator hose is usually but not always the location of the thermostat. Either-way, the top hose gets hot after the thermostat has opened. The time the thermostat takes to open depends upon factors such as:
What do you need to know about cooling system hoses?
In order to withstand the vibration and movements of the engine without breaking, cooling system hoses must be flexible. To achieve this, traditional (and OEM) coolant hoses feature outer layers made of a durable rubber compound. Underneath the rubber outer layer is a flexible fabric reinforcement mesh.
What’s the best way to replace a coolant hose?
Remove the hoses being replaced. Drain the cooling system. Most hoses should gently twist off after you loosen the clamp. 3. Make sure the fitting is not distorted or corroded.
Why are my coolant hoses degrading from the outside?
This coolant hose degraded from the outside. Coolant hoses also degrade when their outsides are exposed to direct contact with oil or other contaminants. This can occur, for example, when hot oil drips onto the rubber from a leaky engine.
In order to withstand the vibration and movements of the engine without breaking, cooling system hoses must be flexible. To achieve this, traditional (and OEM) coolant hoses feature outer layers made of a durable rubber compound. Underneath the rubber outer layer is a flexible fabric reinforcement mesh.
This coolant hose degraded from the outside. Coolant hoses also degrade when their outsides are exposed to direct contact with oil or other contaminants. This can occur, for example, when hot oil drips onto the rubber from a leaky engine.
How does the overflow hose in a radiator work?
An overflow hose runs between the radiator cap and the reservoir tank where extra coolant is stored (and added). As pressures within the cooling system change with coolant temperature, a valve in the radiator cap allows coolant to flow back into the reservoir to relieve pressure buildup which naturally occurs.
What are the symptoms of a bad radiator hose?
Symptoms of a Bad or Failing Radiator Hose. Cost of Replacing a Bad or Failing Radiator Hose. Common signs include leaking coolant, engine overheating, the Low Coolant Light coming on, and radiator hose damage or collapse.
Where does the radiator hose attach to the engine?
The upper hose attaches from the top of the radiator to the top of the engine at the thermostat housing. The lower hose attaches from the bottom of the radiator to the water pump of the engine. If you suspect either radiator hose is failing, watch for the following symptoms:
Is the upper radiator hose supposed to be hot?
Being that water flows through the radiator hose it is also under pressure. The systems are sealed to hold this pressure for one main reason. Water under pressure has a higher boiling point. Similarly one may ask, is the upper radiator hose supposed to be hot?
What causes the top of the radiator hose to swell?
As for radiator hoses, the top hose is genally hotter and breaks the most. What causes upper radiator hose swelling? There are three primary causes for a hose to become swollen. The first is too much pressure. Finally, hoses can become swollen when exposed to very high heats.
Why is my lower radiator hose not running?
If your car is overheating and at the same time won’t heat the lower coolant hose – You most likely have a problem with your thermostat, which needs to get replaced. The thermostat should be closed when the engine is cold and not running.
Can a hot water heater core be clogged?
If the heater core is working properly, both hoses should be warm or hot to the touch; one might be slightly cooler than the other, but not by much. A common symptom is if one hose is hot and the other is cool or cold to the touch. In that case, you might have a clogged heater core. In that scenario, you can try flushing it out.
What causes a radiator to be clogged with coolant?
Such blockages will prevent the proper flow of coolant between the radiator and your engine, thus impeding the radiator’s cooling capabilities. The most common cause of a clogged radiator is old radiator coolant that has been sitting around for extended periods without being changed, or when the engine hasn’t been running for a while.
What happens to coolant when heater core is bad?
The same coolant that goes through the system is the one that goes through the heater core. Having this in mind, if the heater core is bad (meaning leaking) the coolant level will go down. At first, it will be barely noticeable but as the leak worsens you’ll have to add coolant every now and then.
What causes the lower radiator hose to get cold?
Thus, making the lower radiator hose to heat up. It may happen that your car might get low on coolant and is not able to reach the lower radiator. As a result, the lower hose emits cold air. 2. Water Leaks The most common problem that is guilty of this issue is the water leaks. There are several places responsible for these leaks.
Why are the hoses to the heater core cold?
But it sounds like a bunged up heater core…..or a massive air pocket blocking coolant flow into the heater core. With the engine cold and you’ve got reasonable access to safely disconnect your heater core hoses one at a time, disconnect one or the other and have a friend start the engine.
If the heater core is working properly, both hoses should be warm or hot to the touch; one might be slightly cooler than the other, but not by much. A common symptom is if one hose is hot and the other is cool or cold to the touch. In that case, you might have a clogged heater core. In that scenario, you can try flushing it out.
Why is no coolant in radiator but reservoir tank is full?
Consequently, we will concentrate on the signs of no coolant in the radiator but the reservoir tank is full, the causes of lack of coolant in the radiator when there is a full reservoir tank, and the ways to fix this issue. Note that this article is focused solely on liquid cooling systems.
Why is the bottom of my radiator not heating up?
Trapped air is another reason why your radiator isn’t heating up. If you’ve just switched on your heating system after the summer, there can be air trapped in the radiators. This air causes the radiators to become warm at the bottom while remaining cold at the top.
Consequently, we will concentrate on the signs of no coolant in the radiator but the reservoir tank is full, the causes of lack of coolant in the radiator when there is a full reservoir tank, and the ways to fix this issue. Note that this article is focused solely on liquid cooling systems.
What to do if your Radiator is not getting hot?
Besides the radiator not getting hot, other signs of blocked valves include hot pipes (not radiator), noisy radiators, and pinhole leaks. Use your bare hands to adjust the thermostatic valve, or a spanner/valve adjust to tweak the lockshield and manual valves.